Road Conditions; Vehicle Preparation; Power Steering Conditions; Power Steering Operation Noise Check - Ford Transit 2002 Owner's Manual

damaged powertrain/drivetrain mounts.

Road Conditions

An experienced technician will always establish a route that will be used for all NVH
diagnosis road tests. The road selected should be reasonably smooth, level and free of
undulations (unless a particular condition needs to be identified). A smooth asphalt road
that allows driving over a range of speeds is best. Gravel or bumpy roads are unsuitable
because of the additional road noise produced. Once the route is established and
consistently used, the road noise variable is eliminated from the test results.
NOTE: Some concerns may be apparent only on smooth asphalt roads.
If a customer complains of a noise or vibration on a particular road and only on a particular
road, the source of the concern may be the road surface. If possible, try to test the vehicle
on the same type of road.

Vehicle Preparation

Carry out a thorough visual inspection of the vehicle before carrying out the road test. Note
anything which is unusual. Do not repair or adjust any condition until the road test is
carried out, unless the vehicle is inoperative or the condition could pose a hazard to the
technician. After verifying that the condition has been corrected, make sure all components
removed have been installed.

Power Steering Conditions

Check for the noise in the following conditions to verify the customer concern.
Check for the noise in several temperature conditions.
Is the noise from when the vehicle was new?
Can the noise be repeated constantly or is it random?
Check the condition of the vehicle age, mileage and service record.
Interview the customer to find the operating condition in which the noise will occur. Test
the vehicle based on the detail(s) from the customer interview.
Follow the power steering operation noise condition tables below, to find which condition
the noise will occur.

Power Steering Operation Noise Check

Step 1: Check for NVH concerns from non-steering components, which may sound like
noises coming from the steering system.
Parking
Steering central/slightly
off center
REFER to NVH concerns
from other components
column A
NVH concerns from other components
NVH concerns from other condition (column A to D)
Noise
Pedal box knocking
Stabilizer bar link knocking
Engine support insulator knocking
Air conditioning knocking
Suspension knocking (Subframe,
Springs)
Constant velocity (CV) joint
Power assisted steering operating condition
Steering at a steering
lock stop
REFER to NVH
concerns from other
components column B
Drive off, stop driving and slow cornering over
uneven roads
Drive off, driving and cornering
Drive off, driving, acceleration and deceleration
Engine on, activate switch for air conditioning
Drive off, driving, cornering, acceleration and
deceleration
Drive off, driving, cornering, acceleration and
http://vnx.su
Driving
Driving straight ahead Cornering condition
REFER to NVH
concerns from other
components column C
Driving Condition
REFER to NVH
concerns from other
components column D
A B C D
X X O X
X O O X
X X
X X O O
X O X
X O X